Clubbed thumb

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Brachydactyly type D
Clubbed thumb.jpg
Top view of a child with asymmetric brachydactyly type D thumb.
Classification and external resources
Side view of a child with asymmetric BDD

"Clubbed thumb" is a misnomer for stub(by) thumb, known clinically as brachydactyly type D, or BDD.[1] BDD is a harmless genetic trait characterized by the last bone of one or both thumbs being short and round with an accompanying short and wide nail bed.[2]

Digital clubbing,[3] however, is a "clinical sign associated with a number of diseases."[4]

Because of the supposed high incidence of BDD among European royalty in the past, BDD is claimed by some to be a marker of descent from European nobility.[citation needed]

Other names[edit]

The condition is also sometimes known as potter's thumb.[1]